Akd mixing- apparatus



July 31,1928. 1,679,241`

M. DAVID GRINDING AND MIXING APPARATUS Filed Sept. 28, 1925 5Sheets-Sheet l ana. JJL y A s.'

July 31, 192s. 1,679,241

. M. DAVID I GRINDING AND MIXING APPARATU Filed sept. 28, 1925 5Shawna-snaail 2 lil rara F 'amai Application led rlthe present inventionhas i grinding and iiriaijiig` apiL serving tor the preparation of' morov any composition, this ap]j aratus heinp; also capable olf` serving`as a: prindino machine proper, tor the treatment oi" other materialsgfor instance coalen linie or challr, moulding; sand7 ceramic materiahand the like, and its advantage relatively to other apparatus ot thishind and particularly in comparison with cnc-.shing` mills with verticalrollers, resides in its perniittingI to reduce said materials to a mosttenuous powdery and mixed state in a much more economic manner.

According to the present invention; the grinding and mixing apparatuscomprises y object a essentially a horizontal cylindric jacket the inneriace or" which, or p` it, coop* erates witlrclone. shaped or cylindricalsuitably, proi'iled rollers which are controlled hy a driving* shaft,the longitudinal airis of which coincides or nearlycoincides ivith thelongitudinal anis ol' said cylinder, this system being eventuallycompleted hy sera )ers suitably disposed at the lmiding` and charge endsoi said cylindern and series of adjustable scraper-s liet-Ween saidrollers, all these scrapers participatingl with the rotary movement otsaid rollers as a unit.

The annealed drawings represent lay Way ot example tivo differentconstructions ot said apparatus.

Figure 1 represents a side view ol2 apparatus partly in section talrenalong line AB lligure 2.

Figure 2 represents a transverse section in the apparatus taken alongnthe line Cl) liigure 1, the sectional vieiv along CD being see-n in thedirection oit the arrow ai, and that alongin the direction ot the arron7y.

Figures 8a 3b, 3 represent the ditlerent rollers used in the apparatusaccording Fig; ures 1 and 2.

Figure l represents a transverse section along iB Figure 5 in anioditied construction oi the apparatus.

Figure 5 represents a longitudinal section along; @D Figure Li, theroller being; however not shown in this ligure.

lEigure 6 represents' a series ot sc'apers used in the apparatusaccording to Figures l and 5.

Figures l2 lig and 8 represent rollers of diilerent constructions whichmay he us-ed within the apparatus according to the preC`- ent invention.

the the inni-an 'l'E il a8, 1525, Serial 1ro. llfl, and in BelgiumUctober 2, i924.

According to Figures 1, 2,13, 8b, 3C improved grindinp,` and mixingapparatus comprises a cylindrical jacket composed ot the upper part landlower part 2 assembled hy loolts 3 and loi-ming liront Wall Al and arear Wall 5, which form in their turn hearings G and 'l' within which ismounted the driving shaft d provided with a pulley 9 disposed preterahlyat the rear end ot the apparatus. rllhe trent Wall f1 is termed with oneor more openings 10 permitting to look after and to lubrieate the innermovable parts oi the machine, Whereas the rear wall 5 is entirely openat 11 for the same and other purposes, the latter oit which will hedescribed afterwards.

1lllithin the interior of the loiver part 2 of the jacket is lined afalse-bottom 12 of especiallyT resistant material, as it is at this partot the jacket, that the principal grind ing1 and mixing action tairesplace.

the I llpon the shalt 8 are keyed or otherwise rigidly lined afrontcross or equivalent plate 13 and a rear equivalent plate 1li. Eachot these plates is provided with tour or any other suitable number otradial slots oit shalits 1'1", upon which is seated the correspending1roller, a square section, only the end portions ofsaid shafts hein.01 otcylindrii cal section, to permit said sha-its to freely rotate Withinthe hearings 35, these hear nge servingsimultaneously to guide theshatts 17 radially Within the plates 13, 11i. Vllhe particularconstruction of the guide bloc-ks 35a 36 and their disposition Withinthe `grooved slots 16, 37 eliciently avoids janan ming of the shafts 17as Well with respect to the rotary movement as with respect to theradial movementot these latter within plates 13, 14. ln the exampleshown in the drawings there are tour shatts 1'?, and upon these shaftsare tired in any suitable inanner tour rollers 18. According to Figures1 2, 3a, 3b7 3, these rollers are as follows:

(1) Two ot them are o'l identically Vthe same coniiguration and areconstructed as represented in Figure 3a, that is to say their frontside. portion is provided wit-h a. right-handed thread ot considerabledepth and decreasing towards the rear side, this thread occupyingapproximately one half, of the total length of the roller, whereas theirrear side halt' or portion presents a flat peripheral surface.

(2) The third roller (Figure 3b) is provided through nearly one halt etits length kand upon its front side portion with parallel circulargrooves (no thread) whereas its 'rear side portion has a liatperipheralsurface.

(8) The fourth roller (Figure 8C) is provided through nearly one halt'of its length and upon its front side portion with a fiat peripheralsurface, whereas its rear side portion is provided with a lett-handedthread, the characteristics ot which are contrary to that of the threadsot the tirst mentioned runners.

All these runners are of the same dimensions and are of slightly conicalsection diverging towards the front side of the device.

The shaft 8, when considered in the sense of arrow m (Fig. 1) turns in aclockwise sense.

vThe jacket-part l is provided at its lowest front-side right-handportion (arrow with a loading-hopper 22, a spray cone or sprinkler 23withregulating cock 24 being dispose-d for instance within said hopperopposite to thev loading orice.

According to Figures 1 and 2 the rear side portion ol jacket 1, 2, 5,open at 11, forms anenlarged hollow portion 29, serving to receive aring conveyor 27, 28 bolted to projections 26 of the rear platelit. Thering conveyer 27,- 28 cooperates with a sleeve conveyer 31, passing:trom the outside through an opening 30 in part 29 of the jacket, intosaid ringfconveyor 27, 28, and having a suit- Aably shaped beveled Vendportion, which comes into contact with the inner face of part 28 of thering conveyer 27, and which is Vdirected in a sense opposite to thedirection of rotation of the device.

rlhe operation is as "follows:

The rough materials to be treated, are delivered in any convenientmanner to the hopper 22 andl are drawn within the interior of the'device by the threaded portions of the first mentioned rollers 18.These threaded portions produce a preliminary and progressivedisintegration and mixing ot the materials, carrying them simultaneouslytowards the rear end oi the device, thereby obliging them to enterwithin the path oi the fiat shaped portions ot said rollers, where thematerials are denitely reduced to the desired state, the disintegratingaction of the rollers being highly increased by the torsional actionthey produce due to their conical section. At the same tinie water isdelivered under pressure through sprinkler 23, to give the. mass ormaterial in treatment the desired degree et moisture.

The action o'l the second mentioned roller is essentially the saine thatol the lirsst mentioned rollers, with the dilllerence that. this roller,having no thread-shaped grooves, will not displace the materials towardsthe end portion oi the device.

The third mentioned roller serves to retard the displacement ott thematerials towards the rear end of the device, due to its lett handedthreaded endside portion, so obliging those parts oi the material wiichare not yet suiiiciently crushed and mixed, be entirely disintegratedand mixed by the whole roller system.

fis the materials 'treated as above pew-1 from the front to the rear endof the device, they are finally delivered at 25 (Figure l) within thering conveyer 27, 28 and are troni here automatically directed to the:miei-de through the sleeve eonveyer 31.

rlhe device describe-d may be completed by a suitable system ot Scrapersas show in lli ures L1, 5 and 6, this depending principally from thenature of the materials to be treated.

According to Figures 4, 5 and (l, the iront side plate 13 is providedwith one or nim-e scraper plates 38 se ving to wipe oil the niaterialsentering trom the hopper 22, to the interior ot the device, propellingthem simultaneously beneath the front side ends ot the runners.

Moreover, series of scraper plates may extend from the front side plate13 to the rear side plate lll, between two successive. rollers. Suchseries ot scraper plates del fee Figures 5 and may be each pivotahlicennected, on the one hand, to a rod 42 which is rigidly secured toplates 13, 1li, and ou the other hand, to a rod L13 which is secured toplates 13. li in such a irzianuer, as permit ot being adjusted in itslongitudinal sense, for instance by suitably fastening the nuts Li6 uponthe threaded extremities oi" said rod 13. The plates 44 are inclined insuch a manner as to cause. the materials to he treated to advance `fromthe iront side to the rear side ot the device. By more or less incliningthe s ra-per plates Llll in the mentioned direction, the material intreatment will advance with a greater or lese speed. whereby the rate otits disintegration and mixing may be controlled at will.

lf the given material,l for instance moulding sand, is to be treated ata more or less dry state, certain of the rollers 18 er all ot them maybe sul'istituted by rollers aceordingi' to Figures in and T", composedof two discs-r, or cylindrical portions 18a with trininious 19 and otlongitudinal crushing hars i8 fill tlf)

or 18C of circular, ovoidal or other suitable cross-section, which arerigidly secured to said discs.

lt' the material to he treated is desired to advance with incre or lessrapidity i''roni the front to the rear end ot the iiiachine, certain etthe rollers l@ or 18o., Zi, o or all ol thein are substituted by rollersldd (see lligure 8) having only parallel grooves ot sufficient depth andwidth.

According to Figures l and 5, the rear plate o ot the jacket is closedand there is a lateral downwardly inclined conduit el() tor thedischarge oit' the treated material, For this purpose the rear siderotary plate 14e is also provided ivitlione or incre scrapers 33, whichtaire with thein the treated inaterial pressed out trein the pa` 'li otthe rollers, and cause said inatcrial to pass into conduit troni whichit is directed outside, such discharge being assist-cd by cen ritugaltorce and also by the pressure oli' the advancing material.

'lhe plate 5 inay be provided Wit-h a suppleinentary closable orilice llfor discharge, which normally reinains closed.

lt is evident that the device described inay be inodiiied in inanyrespects Without departing iroin the scope oi" the present invention.

W hat l claiin is:

l. ln an apparatus tor the purpose set forth, the combinationcoinorising a stationary cylindrical jacket, ineens iter supplyingmaterial to be treated thereto, iiicans for discharging treatedinaterial tlierefroin, and ineans cooperating with said jacket, saidineans comprising a plurality oli rollers, one ot said rollers having ahelical groove ei;- tending troni iced id toward its dischargeend anddecreasing in depth troni feed end toivaid discharge end and having aportion adjacent the discharge end oit siiiooth conical shape, anotheroit said rollers being ot siinilar construction but its grooved andsmooth. portions being reversed in position and the direction oi' itshelical groove the reverse ot Athat o'j the iirst mentioned roller sothat the action oit the one in the axial inoveinent ot the materialbeing treated will be opposed by the action ot the other, and anotheiroller having an annularly grooved portion and a sinooth conicalportion, its grooved portion heiiig adjacent the feed end oit thejacltet and 'toruied with a plurality ot annular grooves decreasing indepth toward the sniooth portion, said grooved portion serving to o essively crush the inaterial being' trea inoving it axially.

2. ln an apparatus `for the purpose set forth, the combinationcoinpiisiiig a station- D ary cylindrical jaclret, ineans for supplyingmaterial to be treated thereto, insane` tor discharging treatedii'iaterial thereiroin, and

troni its trout toward its rear and decreas` ing in dept-h progressivelyin the sanie direction the said roller having a sinooth conical portionto the rear of said groovcd portion, and another of said rollers beingof similar construction but its slotted and sinooth portions being`reversed in position and the direction ot its helical groove the reverseof that of theiirst incntioned roller so that the action oit the oneroller in the arial Inoveiiient ot the material being treated will beopposed by the action ot the other.

3. ln an apparatus itor the purpose set forth, the combinationcomprising a stationary cylindrical jacket divided into an upper and ayloivor portion, the upper portion being provided laterally at one endwith a leeding hopper, a lluid supply ineans arranged to discharge, atwill, tluid into the interior ol said jacket at a point adjacent thesaid hopper, operative ineans disposed in said jaclret and comprising aplurality oi' rollers, each having' a portion provided with alongitudinally en ;tending helical groove and a sinooth portion adjacentsaid grooved portion, and a roller having a portion provided With aplurality of annular grooves and a siiiooth portion adjacent saidgrooved portion, scraper plates mounted to rotate with said rollersabout a coinnion airis as a unit, said feeding hopper discharging thematerial to he treated laterally into the. path of said scraper platesand the corresponding e'nd portions of said rollers, a hollovv ringrotating with said rollers and receiving the treated inaterial from thedischarge ends thereof, and a discharge sleeve extending through saidjacket and having an open end projecting into said ring' closelyadjacent the peripheral Wall thereof to scrape the treated materialtherefrom into said discharge sleeve.

et. ln an apparatus tor the purpose set torth, the combinationcomprising a stationary cylindrical jacket, ineens for supplyingmaterial to be treated thereto, coinniinuting nieans operativelydisposed in and cooperatingwith said jacket and receiving thc materialto he treated at one end and discharging the treated inaterial at theother end inside ot said aclret, a hollow ring disposed in said jacketadjacent the discharge end of said coinininuting ineans and receivingthe material therefrom as treated, means for rotating said ring, and adischarge sleeve ext-ending through said jacket and projecting into saidhollow ring adjacent the peripheral tace thereoi1 to scrape the treatedinaterial therefrom into said discharge sleeve.

5, In an apparatus tor they purpose set torth, a stationary cylindricaljacket, and

- provided around :i poi-tion of its means disposedL within 'im Vmemedisposed Within and eoopeiai'iiig Willi purpose Set zi siaiatiiig mouaisdisposed Within :incl ooopeuiing viili siii@ jacket and comprisingrolleis oi? which at least one is provided aaotnil iz'is ifoiling facewith a helical gi'oove uml of Wl ai!- othei is formeel mound iis Working'ieee willi ay plurality of annuler giooee.

7. ln appare-tus forth, the combinati. ii l ui'y oyllncliieal jecle,

seid jaeket and compri. at leali; one is formed Wi i around a portion ofits Woll; which another is formed ai'owiifl its Working face with ai`plu grooves, each of said rolleis bein:T form.

8 Tizi zippiiiei'ue foi; i'lie purpose nel;

into an upper, miel i loivei', por in, the upp i .mio 'the polli ol1 lmuy .Vlioieo'l", il have sisfjnml my l fue fspeellieaiiion :itiliii'weip, llelpgliim iliie l? day oi eplemliei', lili/l5.

